Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
  • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
  • G03F7/004—Photosensitive materials
  • G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
  • G03F7/028—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with photosensitivity-increasing substances, e.g. photoinitiators
  • G03F7/029—Inorganic compounds; Onium compounds; Organic compounds having hetero atoms other than oxygen, nitrogen or sulfur
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
  • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
  • C08G59/68—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the catalysts used

Definitions

• This invention relates to liquid compositions. More particularly, this invention relates to liquid compositions containing photodecomposable complex salts.
• photocoploymerizable compositions containing (a) an organic material containing expoxide functionality, (b) an organic material having hydroxyl functionality, and (c) a complex salt photoinitiator selected from aromatic iodonium complex salts and aromatic sulfonium complex salts.
• Such photocopolymerizable compositions are very useful for providing cured coatings on a variety of substrates for decorative or protective reasons.
• Such compositions are typically coated and cured by the manufacturer of the finished article, e.g. beverage can, label stock, coated paper, etc.
• Each such user of these compositions typically specifies the particular physical characteristics which the curable composition, and the cured coating, must exhibit for his particular applications (e.g. color, chemical resistance, coating characteristics, etc.).
• photocopolymerizable compositions may be formulated by each industrial user so as to meet his specific requirements, it is much more common for such compositions to be prepared by coating formulators who specialize in the preparation of coating compositions for industrial use.
• the coating formulators must procure the various necessary ingredients (e.g. base resins, colorants, viscosity modifiers, curatives, etc.) from a number of different sources.
• base resins e.g. acrylic acid, acrylic acid, etc.
• viscosity modifiers e.g. base resins, colorants, viscosity modifiers, curatives, etc.
• a composition comprising a complex salt dissolved in a liquid organic ester in an amount of at least 10% by weight.
• the complex salt may be either a diorganoiodonium complex salt or a triorganosulfonium complex salt.
• the liquid organic esters used herein are of low viscosity and accordingly the complex salt solutions are readily blended with the desired photopolymerizable materials. Further, these organic esters have low affinity for water and, accordingly, simplified procedures may be used in the preparation of the complex salt solutions of this invention. Low affinity for water is particularly important in applications such as photocurable inks and varnishes to be applied by wet lithography. Also, the organic esters are solvents for the diorganoiodonium complex salts and form shelf stable solutions thereof (i.e. solutions are stable over a long period, e.g. one year or more at ambient temperatures). Moreover, the organic esters described herein readily dissolve the complex salts in amounts from 10 to 50% or more by weight, thereby assuring that only a minor amount of solvent need be present in a final formulation containing the required amount of complex salt.
• compositions of the invention contain, as the liquid medium, one or more liquid organic esters.
• the esters used herein are esters of (a) aromatic or aliphatic polycarboxylic acid, and (b) aliphatic alcohols.
• esters used herein are derived from (a) phthalic acid, and (b) an aliphatic alcohol having an oxygen to carbon ratio of at least 1:4; when the oxygen to carbon ratio is 1:4 the alcohol must be a straight chain.
• Another useful type of ester is that derived from (a) an aliphatic acid having at least two carboxyl groups linked directly or by means of a chain havng 1 or 2 carbon atoms (if the two carbon atoms are unsaturated then the carboxyl groups should be in the cis-position), and (b) an aliphatic alcohol having an oxygen to carbon ratio of at least 1:3.
• the preferred liquid organic esters used herein are derived from phthalic acid (when the two carboxylic groups are in the ortho position).
• the aliphatic alcohol used to prepare this type of ester has an oxygen to carbon ratio of at least 1:4. These alcohols are monofunctional and may have only carbon atoms in the skeletal chain or may have oxygen and carbon atoms therein. Representative alcohols would include methanol, ethanol, isopropanol, 3-chloropropanol, allyl alcohol, 2-methoxyethanol, 5,8-dioxodecanol, and the like.
• the aliphatic acids useful for making esters herein are those having at least two carboxylic groups linked directly or by means of a chain having 1 to 4, preferably 1 or 2, carbon atoms.
• Representative aliphatic acids include oxalic, malonic, maleic, succinic, oxydiacetic, glutaric, tricarballylic, 2-bromoglutaric, 3-methylglutaric, and the like.
• the aliphatic alcohol useful in making these esters has an oxygen to carbon ratio of at least 1:3. Suitable representative examples include methanol, ethanol, isopropanol, 2-ethoxyethanol, beta-chloroethanol, and the like.
• organic esters which have been described hereinbefore may be substituted or unsubstituted. If they are substituted the substituents must be neutral, i.e. neither strongly basic nor strongly acidic, and the ester must be free of epoxy-reactive groups (viz, any group that reacts with 1,2-oxirane compounds at temperature of use) such as carboxyl and hydroxyl groups. Suitable substituents would include halogen, alkyl, aryl, and the like.
• Mixtures of organic esters may also be used, if desired. For example, to adjust viscosity one may desire the use of mixtures.
• liquid organic esters useful herein are generally not co-reactive with cationically polymerizable materials.
• Esters boiling below about 150° C. may partially or completely volatilize during the photocuring of compositions to which the concentrated photoinitiator solution has been added.
• Such volatile ester generally contributes very little to pollution because of the very small amount of such ester present in such curable compositions.
• esters boiling above about 175° C. are preferred.
• the complex salts useful in the practice of the present invention include diorganoiodonium complex salts and triorganosulfonium complex salts.
• the diorganoiodonium complex salts may be generally represented by the formula ##STR1## and the useful triorganosulfonium complex salts may be generally represented by the formula: ##STR2## wherein in each of the above formulas R 1 , R 2 , and R 3 can be the same or different, and such groups are selected from aromatic groups having 4 to 20 carbon atoms (e.g.
• Z is selected from the group consisting of oxygen; sulfur; ##STR3## where R 6 is aryl (of 6 to 20 carbons, such as phenyl) or acyl (of 2 to 20 carbons, such as acetyl, benzoyl, etc.); a carbon-to-carbon bond; or ##STR4## where R 4 and R 5 are selected from the group consisting of hydrogen, an alkyl radical having 1 to 4 carbon atoms, and an alkenyl radical having 2 to 4 carbon atoms; and n is zero or 1; and X 31 is a halogen-containing complex anion selected from the group consisting of tetrafluoroborate, hexafluorophosphate, hexafluoroarsenate, and hexafluoroantimonate.
• aromatic iodonium cations are stable and are well known and recognized in the art. See for example, U.S. Pat. Nos. 3,565,906; 3,712,920; 3,759,989; and 3,763,187; F. Beringer, et al., Diaryliodonium Salts IX, J. Am. Chem. Soc. 81, 342-51 (1959) and F. Beringer, et al., Diaryliodonium Salts XXIII, J. Chem. Soc. 1964, 442-51; F. Beringer, et al., Iodionium Salts Containing Heterocyclic Iodine, J. Org. Chem. 30, 1141-8 (1965).
• aromatic iodonium complex salts may be prepared by metathesis of corresponding aromatic iodonium simple salts (such as, for example, the diphenyliodonium bisulfate) in accordance with the teachings of Beringer, et al., J. Am. Chem. Soc. 81, 342 (1959) or the free acid. Additional details regarding the preparation of these complex salts are found in copending application Ser. No. 564,421, incorporated herein by reference.
• the preferred salts are the diaryliodonium hexafluorophosphate and hexafluoroantimonate such as diphenyliodonium hexafluorophosphate and hexafluoroantimonate. These salts are preferred because, in general, they are more thermally stable, promote faster reaction, and are more soluble in inert organic solvents than are other aromatic iodonium salts of complex ions.
• Triaryl-substituted sulfonium compounds for example, can be prepared by the procedures described in G. H. Weigand, et al., Synthesis and Reactions of Triarylsulfonium Halides, J. Org. Chem. 33, 2671-75 (1968).
• the preferred method for making triaryl-substituted sulfonium compounds is described in U.S. Pat. No. 2,807,648, incorporated herein by reference, from which the complex sulfonium salts can be made.
• the complex sulfonium salts can be prepared from the corresponding simple salts, such as the halide salts, by exchange with the complex anion in the form of the salt or free acid.
• the sulfonium complex salts are substituted with three aromatic groups such as those having 4 to 20 carbon atoms and are selected from phenyl, thienyl and furanyl groups. These aromatic groups may optionally have one or more fused benzo rings (e.g. naphthyl and the like; benzothienyl, dibenzothienyl; benzofuranyl, dibenzofuranyl; etc.). Such aromatic groups may also be substituted, if desired, by one or more neutral groups which are essentially non-reactive with epoxide and hydroxy.
• aromatic sulfonium complex salt photoinitiators examples include:
• the complex salts described above are dissolved in the liquid organic ester described above to form liquid solutions in which the complex salt is at a concentration of at least about 10% by weight, preferably about 20 to 50% or more by weight, depending upon the particular salt and liquid organic ester selected and the purpose for which the concentrated composition is prepared.
• the complex salt in dry form may be dissolved directly in the liquid organic ester, this is not the preferred process for preparing the compositions because it generally requires extensive heating and vigorous agitation. It is generally more convenient to prepare the complex salt by extraction from an aqueous solution or suspension followed by drying of the ester solution. A liquid composition of the invention is thereby obtained.
• inert fillers may be included in the compositions of the invention in amounts up to about 25% by weight, although generally there would be no need to include fillers since these are generally added at the time of preparation of the final curable composition.
• liquid compositions of this invention are especially useful as concentrates which may be diluted many-fold with cationically-polymerizable materials, especially epoxides, to form photopolymerizable compositions.
• cationically-polymerizable materials especially epoxides
• Some of the complex salts in the organic ester may form super-saturated liquids or waxy solids at room temperatures which melt readily with moderate heating and are also useful.
• a liquid composition is prepared containing a triarylsulfonium hexafluorophosphate complex salt photoinitiator dissolved in di(methoxyethyl)orthophthalate at a concentration of 50% by weight.
• the complex salt is prepared using as starting material a triarylsulfonium chloride prepared in accordance with the procedure of Example 10 of U.S. Pat. No. 2,807,648 (Pitt), incorporated herein by reference.
• a solution of 28.3 parts of this product in 28.3 parts of water is added to a solution of 17.8 parts of HPF 6 in 65.9 parts of water also containing 35.1 parts of di(methoxyethyl)orthophthalate to dissolve the complex salt precipitate.
• the organic phase is then separated and washed twice with 116.4 parts of deionized water.
• the ester solution is then dried by heating to about 60° C. at 20 torr to remove traces of water.
• a photocurable ink is prepared using the following ingredients:
• a photocurable ink is prepared using the ingredients, and amounts, shown in Example 2 except that the complex salt solution used is diaryliodonium hexafluorophosphate dissolved in dimethyl phthalate at a concentration of 50% by weight.
• a photocurable varnish is prepared using the following ingredients:
• a photocurable varnish is prepared using the following ingredients:
• a photocurable varnish is prepared using the following ingredients:
• compositions of Examples 2-6 are each applied to the desired substrates with, e.g., a rubber roller.
• the coated samples are then passed through a model QC1202 UV processor (from Radiation Polymer Company) with both 200 watt per inch medium pressure mercury vapor lamps turned on. The following results are obtained:
• the solutions of Examples 7-14 are compositions of the present invention.
• the organic acid precursor of the ester of Example 15 has two carboxyl groups linked together by means of a chain having three carbon atoms.
• the alcohol precursor of the ester of Example 16 has an oxygen to carbon ratio of less than 1:3.
• the ester of Example 17 has the two ester groups restrained in the trans-position by the double bond in the chain connecting them.
• the acid precursors of Examples 18 and 19 are aromatic dicarboxylic acids in which the two acid groups are not ortho, but respectively meta and para.

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• Chemical & Material Sciences (AREA)
• Physics & Mathematics (AREA)
• Inorganic Chemistry (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Spectroscopy & Molecular Physics (AREA)
• General Physics & Mathematics (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Epoxy Resins (AREA)
• Inks, Pencil-Leads, Or Crayons (AREA)
• Paints Or Removers (AREA)
• Polymerisation Methods In General (AREA)

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• 1979
  • 1979-01-29 US US06/007,667 patent/US4231886A/en not_active Expired - Lifetime
• 1980
  • 1980-01-25 SE SE8000584A patent/SE448547B/sv unknown
  • 1980-01-25 AU AU54978/80A patent/AU528057B2/en not_active Ceased
  • 1980-01-28 JP JP868880A patent/JPS55102625A/ja active Pending
  • 1980-01-28 GB GB8002837A patent/GB2040947B/en not_active Expired
  • 1980-01-28 DE DE19803002922 patent/DE3002922A1/de active Granted
  • 1980-01-28 FR FR8001728A patent/FR2447387A1/fr active Granted
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Patent Citations (6)

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